#!/usr/bin/env bash

set -o noclobber -o noglob -o nounset -o pipefail
IFS=$'\n'

# If the option `use_preview_script` is set to `true`,
# then this script will be called and its output will be displayed in ranger.
# ANSI color codes are supported.
# STDIN is disabled, so interactive scripts won't work properly

# This script is considered a configuration file and must be updated manually.
# It will be left untouched if you upgrade ranger.

# Meanings of exit codes:
# code | meaning    | action of ranger
# -----+------------+-------------------------------------------
# 0    | success    | Display stdout as preview
# 1    | no preview | Display no preview at all
# 2    | plain text | Display the plain content of the file
# 3    | fix width  | Don't reload when width changes
# 4    | fix height | Don't reload when height changes
# 5    | fix both   | Don't ever reload
# 6    | image      | Display the image `$IMAGE_CACHE_PATH` points to as an image preview
# 7    | image      | Display the file directly as an image

# Script arguments
FILE_PATH="${1}"         # Full path of the highlighted file
PV_WIDTH="${2}"          # Width of the preview pane (number of fitting characters)
PV_HEIGHT="${3}"         # Height of the preview pane (number of fitting characters)
IMAGE_CACHE_PATH="${4}"  # Full path that should be used to cache image preview
PV_IMAGE_ENABLED="${5}"  # 'True' if image previews are enabled, 'False' otherwise.

FILE_EXTENSION="${FILE_PATH##*.}"
FILE_EXTENSION_LOWER="$(printf "%s" "${FILE_EXTENSION}" | tr '[:upper:]' '[:lower:]')"

# Settings
HIGHLIGHT_SIZE_MAX=262143  # 256KiB
HIGHLIGHT_TABWIDTH=8
HIGHLIGHT_STYLE='pablo'
PYGMENTIZE_STYLE='autumn'


handle_extension() {
    case "${FILE_EXTENSION_LOWER}" in
        # Archive
        a|ace|alz|arc|arj|bz|bz2|cab|cpio|deb|gz|jar|lha|lz|lzh|lzma|lzo|\
        rpm|rz|t7z|tar|tbz|tbz2|tgz|tlz|txz|tZ|tzo|war|xpi|xz|Z|zip)
            atool --list -- "${FILE_PATH}" && exit 5
            bsdtar --list --file "${FILE_PATH}" && exit 5
            exit 1;;
        rar)
            # Avoid password prompt by providing empty password
            unrar lt -p- -- "${FILE_PATH}" && exit 5
            exit 1;;
        7z)
            # Avoid password prompt by providing empty password
            7z l -p -- "${FILE_PATH}" && exit 5
            exit 1;;

        # PDF
        pdf)
            # Preview as text conversion
            pdftotext -l 10 -nopgbrk -q -- "${FILE_PATH}" - | fmt -w ${PV_WIDTH} && exit 5
            mutool draw -F txt -i -- "${FILE_PATH}" 1-10 | fmt -w ${PV_WIDTH} && exit 5
            exiftool "${FILE_PATH}" && exit 5
            exit 1;;

        # BitTorrent
        torrent)
            transmission-show -- "${FILE_PATH}" && exit 5
            exit 1;;

        # OpenDocument
        odt|ods|odp|sxw)
            # Preview as text conversion
            odt2txt "${FILE_PATH}" && exit 5
            exit 1;;

        # HTML
        htm|html|xhtml)
            # Preview as text conversion
            w3m -dump "${FILE_PATH}" && exit 5
            lynx -dump -- "${FILE_PATH}" && exit 5
            elinks -dump "${FILE_PATH}" && exit 5
            ;; # Continue with next handler on failure
        # JSON
        json)
            jq --color-output . "${FILE_PATH}" && exit 5
            #python -m json.tool -- "${FILE_PATH}" && exit 5
            #;;
    esac
}

handle_image() {
    # Size of the preview if there are multiple options or it has to be rendered
    # from vector graphics. If the conversion program allows specifying only one
    # dimension while keeping the aspect ratio, the width will be used.
    local DEFAULT_SIZE="1920x1080"

    local mimetype="${1}"
    case "${mimetype}" in
        # SVG
        # image/svg+xml)
        #     convert -- "${FILE_PATH}" "${IMAGE_CACHE_PATH}" && exit 6
        #     exit 1;;

        # DjVu
        # image/vnd.djvu)
        #     ddjvu -format=tiff -quality=90 -page=1 -size="${DEFAULT_SIZE}" \
        #           - "${IMAGE_CACHE_PATH}" < "${FILE_PATH}" \
        #           && exit 6 || exit 1;;

        # Image
        image/*)
            local orientation
            orientation="$( identify -format '%[EXIF:Orientation]\n' -- "${FILE_PATH}" )"
            # If orientation data is present and the image actually
            # needs rotating ("1" means no rotation)...
            if [[ -n "$orientation" && "$orientation" != 1 ]]; then
                # ...auto-rotate the image according to the EXIF data.
                convert -- "${FILE_PATH}" -auto-orient "${IMAGE_CACHE_PATH}" && exit 6
            fi

            # `w3mimgdisplay` will be called for all images (unless overridden as above),
            # but might fail for unsupported types.
            exit 7;;

         # Video
         video/*)
             # Thumbnail
             ffmpegthumbnailer -i "${FILE_PATH}" -o "${IMAGE_CACHE_PATH}" -s 0 && exit 6
             exit 1;;

        # PDF
         application/pdf)
             pdftoppm -f 1 -l 1 \
                      -scale-to-x "${DEFAULT_SIZE%x*}" \
                      -scale-to-y -1 \
                      -singlefile \
                      -jpeg -tiffcompression jpeg \
                      -- "${FILE_PATH}" "${IMAGE_CACHE_PATH%.*}" \
                 && exit 6 || exit 1;;

        # ePub, MOBI, FB2 (using Calibre)
         application/epub+zip|application/x-mobipocket-ebook|application/x-fictionbook+xml)
             ebook-meta --get-cover="${IMAGE_CACHE_PATH}" -- "${FILE_PATH}" > /dev/null \
                 && exit 6 || exit 1;;

        # ePub (using <https://github.com/marianosimone/epub-thumbnailer>)
         application/epub+zip)
             epub-thumbnailer \
                 "${FILE_PATH}" "${IMAGE_CACHE_PATH}" "${DEFAULT_SIZE%x*}" \
                 && exit 6 || exit 1;;

        # Font
        application/font*|application/*opentype)
            preview_png="/tmp/$(basename "${IMAGE_CACHE_PATH%.*}").png"
            if fontimage -o "${preview_png}" \
                         --pixelsize "120" \
                         --fontname \
                         --pixelsize "80" \
                         --text "  ABCDEFGHIJKLMNOPQRSTUVWXYZ  " \
                         --text "  abcdefghijklmnopqrstuvwxyz  " \
                         --text "  0123456789.:,;(*!?') ff fl fi ffi ffl  " \
                         --text "  The quick brown fox jumps over the lazy dog.  " \
                         "${FILE_PATH}";
            then
                convert -- "${preview_png}" "${IMAGE_CACHE_PATH}" \
                    && rm "${preview_png}" \
                    && exit 6
            else
                exit 1
            fi
            ;;

        # Preview archives using the first image inside.
         #(Very useful for comic book collections for example.)
         application/zip|application/x-rar|application/x-7z-compressed|\
             application/x-xz|application/x-bzip2|application/x-gzip|application/x-tar)
             local fn=""; local fe=""
             local zip=""; local rar=""; local tar=""; local bsd=""
             case "${mimetype}" in
                 application/zip) zip=1 ;;
                 application/x-rar) rar=1 ;;
                 application/x-7z-compressed) ;;
                 *) tar=1 ;;
             esac
             { [ "$tar" ] && fn=$(tar --list --file "${FILE_PATH}"); } || \
             { fn=$(bsdtar --list --file "${FILE_PATH}") && bsd=1 && tar=""; } || \
             { [ "$rar" ] && fn=$(unrar lb -p- -- "${FILE_PATH}"); } || \
             { [ "$zip" ] && fn=$(zipinfo -1 -- "${FILE_PATH}"); } || return
        
             fn=$(echo "$fn" | python -c "import sys; import mimetypes as m; \
                     [ print(l, end='') for l in sys.stdin if \
                       (m.guess_type(l[:-1])[0] or '').startswith('image/') ]" |\
                 sort -V | head -n 1)
             [ "$fn" = "" ] && return
             [ "$bsd" ] && fn=$(printf '%b' "$fn")
        
             [ "$tar" ] && tar --extract --to-stdout \
                 --file "${FILE_PATH}" -- "$fn" > "${IMAGE_CACHE_PATH}" && exit 6
             fe=$(echo -n "$fn" | sed 's/[][*?\]/\\\0/g')
             [ "$bsd" ] && bsdtar --extract --to-stdout \
                 --file "${FILE_PATH}" -- "$fe" > "${IMAGE_CACHE_PATH}" && exit 6
             [ "$bsd" ] || [ "$tar" ] && rm -- "${IMAGE_CACHE_PATH}"
             [ "$rar" ] && unrar p -p- -inul -- "${FILE_PATH}" "$fn" > \
                 "${IMAGE_CACHE_PATH}" && exit 6
             [ "$zip" ] && unzip -pP "" -- "${FILE_PATH}" "$fe" > \
                 "${IMAGE_CACHE_PATH}" && exit 6
             [ "$rar" ] || [ "$zip" ] && rm -- "${IMAGE_CACHE_PATH}"
             ;;
    esac
}

handle_mime() {
    local mimetype="${1}"
    case "${mimetype}" in
        # Text
        text/* | */xml)
            if  command -v ccat &>/dev/null; then
                ccat --color=always ${FILE_PATH}
                exit 0
            fi
            exit 2;;

        # DjVu
        image/vnd.djvu)
            # Preview as text conversion (requires djvulibre)
            djvutxt "${FILE_PATH}" | fmt -w ${PV_WIDTH} && exit 5
            exiftool "${FILE_PATH}" && exit 5
            exit 1;;

        # Image
        image/*)
            # Preview as text conversion
            # img2txt --gamma=0.6 --width="${PV_WIDTH}" -- "${FILE_PATH}" && exit 4
            exiftool "${FILE_PATH}" && exit 5
            exit 1;;

        # Video and audio
        video/* | audio/*)
            mediainfo "${FILE_PATH}" && exit 5
            exiftool "${FILE_PATH}" && exit 5
            exit 1;;
    esac
}

handle_fallback() {
    echo '----- File Type Classification -----' && file --dereference --brief -- "${FILE_PATH}" && exit 5
    exit 1
}


MIMETYPE="$( file --dereference --brief --mime-type -- "${FILE_PATH}" )"
if [[ "${PV_IMAGE_ENABLED}" == 'True' ]]; then
    handle_image "${MIMETYPE}"
fi
handle_extension
handle_mime "${MIMETYPE}"
handle_fallback

exit 1
